Brush for dynamo-electric machinery.



' PATENTED APR. 9, 1907.

' G. W. SPEIRS.

BRUSH FOR DYNAMO ELECTRIC MACHINERY.

APPLICATION FILED NOV.26,1906.

[muawfor MW 57% 7 .ffzm' W UNITED STATES PATEN T UFFIGEL CHARLES WILLIAMSPEIRS, OF LONDON, ENGLAND, ASSlG-NOR TO THE MOR- GAN CRUCIBLE COMPANY,LIMITED, OF LONDON, ENGLAND.

Specification of Letters Eatent.

Patented Aprn 9, 1907.

Application filed November 26, 1906. Serial No 345,219.

To all whom it may concern:

Be it known that I, CHARLES WILLIAM Spams, a subject of the King ofGreat Britain, residing at Battersea Works, Batter-sea, London, England,have invented new and useful Improvements in Brushes forDynainc-Electric Machinery, of which the following is a specification.

This invention relates to brushes for dynamo-electric machinery and tothat class of brush which is formed by compressing flaked 7 naturalplumbago, either alone or mixed with metal orother materials, intoblocks of the desired shape and without burning, the obect of the saidinvention being to provide improved means Tor connecting all layers orlaminations in such brushes together and with the leads or conductors.

According to the invention a metal plate or cap is applied to the brushduring the manufacture of the game, to which metal plate the leads orconductors can be connected in any desirable manner.

In a suitable arrangement for carrying out the invention the late or capis formed at its ends with flanged lips or projections which constituterecesses into whlch the material of the brush will be compressed andwhich serve for keiying the said'cap upon the brush. This cap is aid inthe mold before the plumbago, and the latter is pressed into the capduring the compressing operation.

In practice a flexible lead is advantageously attached to the under sideof the cap before the material is pressed into it, an eye or ferrulebeing arranged around that part of the lead which extends through thebody of the brush, the said eye or ferrule being also partly embedded inthe material.

' In the accompanying drawings, Figure 1 is an elevation of a brushprovided with a cap in accordance with the invention. Fig. 2 is alongitudinal section of the same, and Fig. 3 is an edge view. Fig. 4 isa sectional front elevation of a brush, showing the arrangement of aflexible lead attached to the under side of the cap, and Fig. 5 is asectional edge View of the same.

a indicates the metal cap, which, as shown, is of a size correspondingto the width and thickness of the brush 1), the ends of this cap beingprovided with the flanged ends I) I), forming the recesses c c, or beingprovided with other suitable projections or recesses.

This cap is inserted into the mold at one end thereof, and the preparedmaterial o'l' wluch I the bruslris to be formed is then fed into themold and compressed in the usual manner, the material conr ressed in therecesses c 0 serving to retaih t e cap in position.

Owing to the great pressure to which the brush is subjected, it Willbra-understood that a very intimate connection is roduced between thesurface of the cap am the material of the brush. As hereinbefore stated,the lead or conductor may be connected to this cap in any suitablemanner.

In Figs. 4 and 5 the lead dis represented as being attached to the underside of the cap, a strip a of the said cap being pressed down in orderto form a slot or pocket through which the end of the load can beinserted, the said end being fixed by pressing back the strip onto it.In making this brush the cap is placed in the mold, as hereinbeforedescribed, and the lead is inserted through a hole in the bottom of themold with an eyelete around it, so that when the pressure is a plied theeyelet will be fixed, while the en portions of the lead will becomeembedded in the'body of the ma terial, as clearly indicated in Fig. 5.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim. is

1. A commutator-brush composed of compressed particles and provided witha metal strip having one entire face thereof in intimate contact withsaid compressed particles and havingportions embedded therein topermanently attach the same to said brush, substantially as described.

2. The combination with a commutatorbrush composed of compressedparticles, of a metal strip permanently secured to said. brush and aconductor having a .portion thereof embedded insaid brush and connectedwith. said metal strip, substantially as described.

3. The combination with a commutator-' brush composed of compressedparticles, of an eyelet partly embedded therein and a con ductor havinga portion embedded in said brush and a portion projecting from saidbrush throughsaid eyelet, substantially as described.

4. The combination with a commutatorbrush composed of compressedparticles, of a end passing through said slots in. ssidee- E pressedportion of said strip and firmly retained in contact with sgmid strip,substantially as described.

5. The combination vith a commutatorbrush composed of compressedparticles, of a metal strip secured to said. brush, said strip beingprovided with a depressed portienheving slots therein, and aeonduetorhaving its Bough said slot .'d strip.

! :essed pol-tie]! i said ceudm er Lv R. CASEY.

